Heading to San Diego

Soooo...remember how a week ago I was super excited about visiting St. Thomas? Well, it sure looks like Irma and Juan are going to thwart that plan, so we're looking into back-up plans. Right now, I think our best bet is San Diego, as neither of us have really actually been there and there are tons of things to do, and we don't even need to rent a car to do it all. 
photo creditI've tentatively booked myself into our timeshare near Balboa Park, so we can walk to 80% of the things we want...